Add 12-month growth plan, baseline, weekly log and measurement loop

Week-by-week plan grounded in current GSC data (4,745 impressions, 9 clicks,
CTR 0.19%, hosting cluster at position 27.5, 1,090 impressions on page-1
zero-click queries). One bounded change per week, measured the following week.
Snapshot script: ~/.hermes/scripts/growth_week.py.

growth/WEEKLY-LOG.md

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+# Weekly log
+
+One entry per week. The hypothesis and the metric are written **before** the change ships;
+the measurement is filled in by the following week's run. A week without a measurement is
+an unfinished week.
+
+| Week | Date | Change | Hypothesis | Metric watched | Expected | Measured | Verdict |
+|---|---|---|---|---|---|---|---|
+| 0 | 2026-10-24 | Instrumentation: Plausible tag on 1,206 pages, `Affiliate Click` / `Outbound Click` custom events, UTM on 479 outbound links, CTA blocks on 6 homepages + 6 hosting hubs, weekly loop installed | Without measurement every change is a guess | all | baseline established | n/a (setup) | keep |
+
+---
+
+## Entry template
+
+```markdown
+### Week N — YYYY-MM-DD
+
+**Shipped:** <what changed, with commit hash>
+**Hypothesis:** <why this should move a number>
+**Metric:** <the one number that decides>
+**Expected:** <direction and rough size>
+
+**Measured (week N+1):** <actual, from growth_week.py>
+**Verdict:** keep / revert / adjust — and why
+
+**Next:** <carried into the following week>
+```